Low-noise vacuum release suction device and controllable aspirator using same

A suction device for an aspirator connectable to a vacuum source, said suction device, comprising:

• a) a body including an external surface;
• b) an inlet port located at a first end of said body;
• c) an outlet port located at a second end of said body;
• d) a chamber comprising a cross-section defined by a diverging portion from said inlet port to a junction position and a converging portion from said junction position to said outlet port;
• and
• e) a bypass inlet extending through said body from said external surface in the vicinity of said inlet port to said chamber in the vicinity of said junction position, wherein said bypass inlet diverges through said body from said external surface to said chamber.

An aspirator connectable to a vacuum source for aspiring particles and or fluids comprising:

• a suction device including:
• a) a body comprising an external surface;
• b) an inlet port located at a first end of said body;
• c) an outlet port located at a second end of said body;
• d) a chamber extending in said body along a longitudinal axis from said inlet port to said outlet port;
• and
• e) a bypass inlet diverging through said body from an outer aperture in said external surface to an inner aperture in said chamber;
• whereby upon operation of the vacuum source sealingly mounted to said outlet port, a first suction flow is generated at said inlet port and a second suction flow is generated at said bypass inlet such that said first suction flow and said second suction flow combine in said chamber near said inner aperture.

A suction system for an aspirator connectable to a vacuum source, comprising:

• a) a suction device including:
• i) a body including an external surface;
• ii) an inlet port located at a first end of said body;
• iii) an outlet port located at a second end of said body;
• iv) a chamber extending inside said body from said inlet port to said outlet port along a longitudinal axis;
• said chamber defining a flow direction from said inlet port to said outlet port, said chamber comprising a converging portion thereof;
• and
• v) a bypass inlet extending through said body at an acute angle with respect to the flow direction from an outer aperture on said external surface of said body to an inner aperture in said chamber, said bypass inlet merging into said chamber converging portion;
• and
• b) a control means operatively mounted over said outer aperture for at least partially blocking said bypass inlet;
• wherein said converging portion is preceded by a diverging portion of said chamber, whereby upon operation of the vacuum source sealingly mounted to said outlet port, a first suction force is generated at said inlet port and a second suction force is generated at said bypass inlet, said first suction force being variable upon actuation of said control means.